== "mwifiex crash on idle/using"
I heard this issue only from Surface 3 and SP5 owners.
It can be fixed by disabling ASPM L1 state. I think this is the hardest issue
to fix. So, I hope at least we could fix the mwifiex reset feature (see below).
== "mwifiex reset feature broken"
I think this issue is common on all devices that use the 88W8897 chip.
You can reproduce this issue by the following command:
echo 1 | sudo tee /sys/kernel/debug/mwifiex/mlan0/reset
Expected: mwifiex is usable after this reset.
Actual: mwifiex is broke after this reset with following dmesg output
$ echo 1 | sudo tee /sys/kernel/debug/mwifiex/mlan0/reset
mwifiex_pcie 0000:03:00.0: Resetting per request
mwifiex_pcie 0000:03:00.0: info: successfully disconnected from [BSSID]:
reason code 3
mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
mwifiex_pcie 0000:03:00.0: deleting the crypto keys
mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
mwifiex_pcie 0000:03:00.0: deleting the crypto keys
mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
mwifiex_pcie 0000:03:00.0: deleting the crypto keys
mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
mwifiex_pcie 0000:03:00.0: deleting the crypto keys
mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
mwifiex_pcie 0000:03:00.0: deleting the crypto keys
mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
mwifiex_pcie 0000:03:00.0: deleting the crypto keys
mwifiex_pcie 0000:03:00.0: info: shutdown mwifiex...
mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
mwifiex_pcie 0000:03:00.0: WLAN FW already running! Skip FW dnld
mwifiex_pcie 0000:03:00.0: WLAN FW is active
mwifiex_pcie 0000:03:00.0: Unknown api_id: 4
mwifiex_pcie 0000:03:00.0: info: MWIFIEX VERSION: mwifiex 1.0
(15.68.19.p21)
mwifiex_pcie 0000:03:00.0: driver_version = mwifiex 1.0 (15.68.19.p21)
mwifiex_pcie 0000:03:00.0: info: trying to associate to '[SSID]' bssid
[BSSID]
mwifiex_pcie 0000:03:00.0: info: associated to bssid [BSSID]
successfully
mwifiex_pcie 0000:03:00.0: cmd_wait_q terminated: -110
mwifiex_pcie 0000:03:00.0: info: successfully disconnected from [BSSID]:
reason code 15
mwifiex_pcie 0000:03:00.0: cmd_wait_q terminated: -110
mwifiex_pcie 0000:03:00.0: deleting the crypto keys
mwifiex_pcie 0000:03:00.0: cmd_wait_q terminated: -110
mwifiex_pcie 0000:03:00.0: deleting the crypto keys
mwifiex_pcie 0000:03:00.0: cmd_wait_q terminated: -110
mwifiex_pcie 0000:03:00.0: deleting the crypto keys
[...]
Also, does anyone know what is the expected behavior on function level
reset? Should firmware be re-downloaded? As you can see on the dmesg
log, fw is still active after the reset. ("WLAN FW already running! Skip
FW dnld")
== "power_save causes connection instability at least on 5GHz APs"
"connection instability" here means not crash, but networking stop, like
ping not responding.
I think this issue is common on all devices that use the 88W8897 chip.
- You can mitigate this issue by showing APs continuously (nmcli d wifi list)
- Or you can prevent this issue by disabling power_save
(sudo iw dev mlan0 set power_save off)
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https://bugs.launchpad.net/bugs/1730924
Title:
Wifi does down "crash" in Surface Pro 4
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